stand alone EFI for gen3 hemis

I'm willing to bet dollars to donuts that lxmodguys standalone is based on ms3, just like EFI source.

Rat patrol- I don't understand your question on MS3. But know the MS3x is on par with the $3000 FAST kit in regards to features and tuneability.

I had a WOT tune dialed in within 2 hours on the dyno using my MS3x.

You should do a little reading on tuning. Most tuning occurs in the VE table and Spark advance table. Factory computer, FAST, and MS3x (includes lxmodguy and EFI source): they all use VE and spark tables for tuning.

If you want factory knock control and don't care to tune yourself- get the factory set up.

If you don't care about knock control and want to tune yourself, then get the FAST or any of the MS3x systems. These stand alone options have a ton of features that you can also use. Here is a short list comparing MS3x and FAST.
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The FAST XFI and MS3 are pretty similar on paper. I'm looking through
the FAST manual to see if there's any major differences, and here's what
I have noticed. Look like some points land in favor of FAST and some for
MS3. Overall, the MS3 has a bit more precise fuel control.

1. The fuel and ignition tuning process is almost EXACTLY the same for
the main fuel and spark maps. Unlike some of the other John Meany ECUs,
the FAST system uses a VE type fuel table, which MS also does.

2. The only acceleration enrichment option in FAST is a "accelerator
pump" type enrichment; MS3 (and MS2) also has a model based acceleration
enrichment that is a bit more sophisticated. This generally has very
little effect on a drag car; it's more useful on a road racer.

3. FAST has more nitrous channels (4 instead of 2), while MS3 can run
its nitrous control progressively.

4. FAST boost control is closed loop only. MS3 (and MS2) has closed and
open loop boost control. MS3 can also adjust boost as a function of
vehicle speed - although this is not allowed in the NHRA.

5. FAST has a dedicated EGR function (this could be done with a generic
output on MS3).

6. FAST has a time based traction control option to meet NHRA rules
against monitoring wheel speed.

7. FAST individual cylinder corrections are a fixed percent or degree.
MS3 has 6 x 6 tables for each cylinder.

8. FAST has 8 extra analog inputs; MS3 has 3 to 5 depending on setup.

9. FAST can switch between 4 internally stored maps; MS3 has 2.

10. FAST does not support MAF input or blending alpha N with speed
density. MS3 (and MS2) supports both.

11. FAST does not seem to have the same sort of gradual staged injection
capabilities as MS3 and MS2, although I could be wrong.

Thanks,

Matt Cramer
DIYAutoTune.com
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